The Collaborative International Dictionary of English v.0.48:
May \May\, n. [F. Mai, L. Maius; so named in honor of the
goddess Maia (Gr. Mai^a), daughter of Atlas and mother of
Mercury by Jupiter.]
1. The fifth month of the year, containing thirty-one days.
2. The early part or springtime of life.
His May of youth, and bloom of lustihood. --Shak.
3. (Bot.) The flowers of the hawthorn; -- so called from
their time of blossoming; also, the hawthorn.
The palm and may make country houses gay. --Nash.
Plumes that mocked the may. --Tennyson.
4. The merrymaking of May Day. --Tennyson.
Italian may (Bot.), a shrubby species of Spiraea
(Spiraea hypericifolia) with many clusters of small
white flowers along the slender branches.
May apple (Bot.), the fruit of an American plant
(Podophyllum peltatum). Also, the plant itself
(popularly called mandrake), which has two lobed leaves,
and bears a single egg-shaped fruit at the forking. The
root and leaves, used in medicine, are powerfully drastic.
May beetle, May bug (Zool.), any one of numerous species
of large lamellicorn beetles that appear in the winged
state in May. They belong to Melolontha, and allied
genera. Called also June beetle.
May Day, the first day of May; -- celebrated in the rustic
parts of England by the crowning of a May queen with a
garland, and by dancing about a May pole.
May dew, the morning dew of the first day of May, to which
magical properties were attributed.
May flower (Bot.), a plant that flowers in May; also, its
blossom. See Mayflower, in the vocabulary.
May fly (Zool.), any species of Ephemera, and allied
genera; -- so called because the mature flies of many
species appear in May. See Ephemeral fly, under
May game, any May-day sport.
May lady, the queen or lady of May, in old May games.
May lily (Bot.), the lily of the valley (Convallaria
May pole. See Maypole in the Vocabulary.
May queen, a girl or young woman crowned queen in the
sports of May Day.
May thorn, the hawthorn.